OLED Encapsulation Layer Prevents Moisture Ingress
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Solution Overview
Problem
Organic light-emitting display devices are vulnerable to moisture and oxygen, which can lead to degradation and the formation of dark spots due to diffusion into the emission layer, reducing their lifetime.
Innovation Solution
An organic light-emitting display device design that includes a substrate with defined display and non-display regions, featuring a bridge wiring that connects pad units and wiring units across these regions, and an encapsulation layer with alternating inorganic and organic thin films to prevent impurities from penetrating and causing damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic light-emitting device is exposed to moisture and oxygen, then the device can operate and emit light, but the organic emission layer degrades and forms oxides, reducing device lifetime
Solution Approach 1:
The patent applies an encapsulation layer comprising alternating inorganic and organic thin films to seal the organic light-emitting device. This multi-layer thin film structure prevents moisture and oxygen from reaching the emission layer, thereby protecting against degradation and extending device lifetime while maintaining the operational functionality of the device.
Solution Approach 2:
The encapsulation layer uses a composite structure of alternating inorganic and organic thin films. The inorganic layers provide barrier properties against moisture and oxygen penetration, while the organic layers provide flexibility and adhesion. This composite material approach creates an effective seal that prevents harmful factors from reaching the sensitive organic emission layer.
2Reliability
If an encapsulation layer is added to prevent moisture and oxygen penetration, then device lifetime is extended, but the device structure becomes more complex
Solution Approach 1:
The encapsulation layer is segmented into multiple alternating thin films of inorganic and organic materials. This segmentation allows each layer to perform its specific function (barrier protection or flexibility/adhesion) while collectively providing comprehensive protection. The segmented structure prevents moisture and oxygen penetration effectively without requiring a single overly complex encapsulation system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively prevents the ingress of moisture and oxygen, thereby enhancing the longevity and reliability of the organic light-emitting display device by isolating the internal components from external contaminants.
Implementation Method 1
when oxygen or moisture diffuses into the emission layer including the organic material
Data Source
AI summary
An organic light-emitting display device including a substrate on which a display region and a non-display region are defined is described, the organic light-emitting display device comprising: a first electrode disposed on a substrate; an intermediate layer disposed on the first electrode and including an organic light-emitting layer; a second electrode disposed on the intermediate layer; an encapsulation layer disposed on the substrate; a plurality of pad units disposed on the non-display region; a wiring unit disposed on the display region; and a bridge wiring that is disposed across the display region and the non-display region and connects one of the plurality of pad units and the wiring unit to each other.